Apartment is on 4th floor, but there are two elevators. Swimming pool and gym are good and almost always empty. The apartment building is at the beginning of quiet street (very limited car traffic). In the front of the building there is a small "restaurant". There is may places to eat around. 2-3 minutes from the building (turn left) there is a local food market. In the front of the street (where apartment is located) there is 7/11. If you turn right there is small Tesco Lotus. Behind the 7/11 there is a local bar with live music from time to time. You will always meet there some foreigners. All food places are offering local simple food. If you are looking for "restaurant with waiters" the closest will be I think by the Punnawithi BTS station (on the right side of the street before BTS station).
The apartment building is located approx. 5-12 minutes of walking distance from Punnawithi BTS station. On the main street, on the right side, you can find motorbikes that take you to the station for 10B (1-3 minutes). Two stops by BTS train there is On Nut BTS station with shopping mall (also movie theater) and very large Tesco Lotus. Four stops further there is Ekkamai BTS station with a large shopping mall with many quite good restaurants. The closest money exchange, I think, is at On Nut BTS station. Close to Ekkamai BTS there is a bus station with buses to Pattaya (around 2 hours, around 110B).
Cost of GrabTaxi ("local Uber") to the Suvarnabhumi International Airport has been less than 400B. But I think for one person sometimes will be better (faster and cheaper) to go by BTS and Airport Link. When you use GrabTaxi App just write "the green iii" and you will see the full address.
The apartment was a little above my expectations. Kitchen is well equipped. In the toilet I found many basic toiletries (shampoo, soap, etc.). There are also many basic cleaning products. Building is very quiet.
Nulpa was a very good host with very flexible approach. Information she provides are clear and reliable. Communication was always very fast. We used Whats App. She sent me a new kettle the next day I informed her about the problem with the old one. I stayed there 29 nights.